526 lines
15 KiB
C
526 lines
15 KiB
C
/*****************************************************************************
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*
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* $Id$
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* Purpose ...............: MD5 for binkp protocol driver
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*
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*****************************************************************************
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* Copyright (C) 1997-2003
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*
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* Michiel Broek FIDO: 2:280/2802
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* Beekmansbos 10
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* 1971 BV IJmuiden
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* the Netherlands
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*
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* This file is part of MBSE BBS.
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*
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* This BBS is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* MBSE BBS is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
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/*
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* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
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*/
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/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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License to copy and use this software is granted provided that it
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is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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Algorithm" in all material mentioning or referencing this software
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or this function.
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License is also granted to make and use derivative works provided
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that such works are identified as "derived from the RSA Data
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Security, Inc. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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RSA Data Security, Inc. makes no representations concerning either
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the merchantability of this software or the suitability of this
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software for any particular purpose. It is provided "as is"
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without express or implied warranty of any kind.
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These notices must be retained in any copies of any part of this
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documentation and/or software.
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*/
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#include "../config.h"
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#include "../lib/libs.h"
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#include "../lib/structs.h"
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#include "../lib/common.h"
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#include "../lib/nodelist.h"
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#include "../lib/clcomm.h"
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#include "lutil.h"
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#include "md5b.h"
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extern int ext_rand;
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/*
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* Constants for MD5Transform routine.
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*/
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#define S11 7
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#define S12 12
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#define S13 17
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#define S14 22
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#define S21 5
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#define S22 9
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#define S23 14
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#define S24 20
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#define S31 4
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#define S32 11
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#define S33 16
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#define S34 23
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#define S41 6
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#define S42 10
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#define S43 15
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#define S44 21
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static void MD5Transform(UINT4 [4], unsigned char [64]);
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static void Encode(unsigned char *, UINT4 *, unsigned int);
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static void Decode(UINT4 *, unsigned char *, unsigned int);
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static void MD5_memcpy(POINTER, POINTER, unsigned int);
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static void MD5_memset(POINTER, int, unsigned int);
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static unsigned char PADDING[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/* F, G, H and I are basic MD5 functions.
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*/
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
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*/
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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Rotation is separate from addition to prevent recomputation.
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*/
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#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }
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#define GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }
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#define HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }
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#define II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); (a) = ROTATE_LEFT ((a), (s)); (a) += (b); }
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/* MD5 initialization. Begins an MD5 operation, writing a new context.
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*/
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static void MD5Init(MD5_CTX *context)
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{
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context->count[0] = context->count[1] = 0;
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/* Load magic initialization constants.
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*/
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context->state[0] = 0x67452301;
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context->state[1] = 0xefcdab89;
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context->state[2] = 0x98badcfe;
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context->state[3] = 0x10325476;
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}
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/*
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* MD5 block update operation. Continues an MD5 message-digest
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* operation, processing another message block, and updating the
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* context.
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*/
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static void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputLen)
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{
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unsigned int i, mdindex, partLen;
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/* Compute number of bytes mod 64 */
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mdindex = (unsigned int)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))
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context->count[1]++;
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context->count[1] += ((UINT4)inputLen >> 29);
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partLen = 64 - mdindex;
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/* Transform as many times as possible. */
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if (inputLen >= partLen) {
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MD5_memcpy ((POINTER)&context->buffer[mdindex], (POINTER)input, partLen);
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MD5Transform (context->state, context->buffer);
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for (i = partLen; i + 63 < inputLen; i += 64)
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MD5Transform (context->state, &input[i]);
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mdindex = 0;
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} else
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i = 0;
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/* Buffer remaining input */
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MD5_memcpy ((POINTER)&context->buffer[mdindex], (POINTER)&input[i], inputLen-i);
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}
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/*
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* MD5 finalization. Ends an MD5 message-digest operation, writing the
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* the message digest and zeroizing the context.
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*/
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static void MD5Final(unsigned char digest[16], MD5_CTX *context)
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{
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unsigned char bits[8];
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unsigned int mdindex, padLen;
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/* Save number of bits */
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Encode (bits, context->count, 8);
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/* Pad out to 56 mod 64. */
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mdindex = (unsigned int)((context->count[0] >> 3) & 0x3f);
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padLen = (mdindex < 56) ? (56 - mdindex) : (120 - mdindex);
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MD5Update (context, PADDING, padLen);
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/* Append length (before padding) */
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MD5Update (context, bits, 8);
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/* Store state in digest */
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Encode (digest, context->state, 16);
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/* Zeroize sensitive information. */
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MD5_memset ((POINTER)context, 0, sizeof (*context));
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}
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/*
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* MD5 basic transformation. Transforms state based on block.
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*/
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static void MD5Transform (UINT4 state[4], unsigned char block[64])
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{
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UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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Decode (x, block, 64);
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/* Round 1 */
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FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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/* Round 2 */
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GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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/* Zeroize sensitive information. */
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MD5_memset ((POINTER)x, 0, sizeof (x));
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}
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/*
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* Encodes input (UINT4) into output (unsigned char). Assumes len is
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* a multiple of 4.
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*/
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static void Encode (unsigned char *output, UINT4 *input, unsigned int len)
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (unsigned char)(input[i] & 0xff);
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output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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}
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}
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/*
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* Decodes input (unsigned char) into output (UINT4). Assumes len is
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* a multiple of 4.
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*/
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static void Decode (UINT4 *output, unsigned char *input, unsigned int len)
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4)
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output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
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}
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/*
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* Note: Replace "for loop" with standard memcpy if possible.
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*/
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static void MD5_memcpy (POINTER output, POINTER input, unsigned int len)
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{
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unsigned int i;
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for (i = 0; i < len; i++)
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output[i] = input[i];
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}
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/*
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* Note: Replace "for loop" with standard memset if possible.
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*/
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static void MD5_memset (POINTER output, int value, unsigned int len)
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{
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unsigned int i;
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for (i = 0; i < len; i++)
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((char *)output)[i] = (char)value;
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}
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/* ---------------------------------------------------------- */
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static void hmac_md5(unsigned char *text, int text_len, unsigned char *key, int key_len, MDcaddr_t digest)
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{
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MD5_CTX context;
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unsigned char k_ipad[65]; /* inner padding - key XORd with ipad */
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unsigned char k_opad[65]; /* outer padding - key XORd with opad */
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unsigned char tk[16];
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int i;
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/* if key is longer than 64 bytes reset it to key=MD5(key) */
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if (key_len > 64) {
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MD5_CTX tctx;
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MD5Init(&tctx);
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MD5Update(&tctx, key, key_len);
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MD5Final(tk, &tctx);
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key = tk;
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key_len = 16;
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}
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/*
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* the HMAC_MD5 transform looks like:
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*
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* MD5(K XOR opad, MD5(K XOR ipad, text))
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*
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* where K is an n byte key
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* ipad is the byte 0x36 repeated 64 times
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* opad is the byte 0x5c repeated 64 times
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* and text is the data being protected
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*/
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/* start out by storing key in pads */
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memset((char *) k_ipad, 0, sizeof k_ipad);
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memset((char *) k_opad, 0, sizeof k_opad);
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memmove( k_ipad, key, key_len);
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memmove( k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < 64; i++) {
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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/*
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* perform inner MD5
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*/
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MD5Init(&context); /* init context for 1st pass */
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MD5Update(&context, k_ipad, 64); /* start with inner pad */
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MD5Update(&context, text, text_len); /* then text of datagram */
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MD5Final(digest, &context); /* finish up 1st pass */
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/*
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* perform outer MD5
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*/
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MD5Init(&context); /* init context for 2nd pass */
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MD5Update(&context, k_opad, 64); /* start with outer pad */
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MD5Update(&context, digest, 16); /* then results of 1st hash */
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MD5Final(digest, &context); /* finish up 2nd pass */
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}
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/* ---------------------------------------------------------- */
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static void getrand(unsigned char *res, int len, struct sockaddr_in *peer_name)
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{
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MDcaddr_t digest;
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struct {
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time_t tm;
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unsigned short pid;
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unsigned short rand;
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int ext_rand;
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} rd;
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time(&rd.tm);
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rd.pid = (int)getpid();
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rd.rand = rand();
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rd.ext_rand = ext_rand;
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hmac_md5((void *)&rd, sizeof(rd), (void *)peer_name, sizeof(struct sockaddr_in), digest);
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if ((peer_name) /* && (peer_name[0]) */)
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hmac_md5((void *)peer_name, sizeof(struct sockaddr_in), digest, sizeof(digest), digest);
|
|
memcpy(res, digest, len);
|
|
}
|
|
|
|
|
|
|
|
unsigned char *MD_getChallenge(char *str, struct sockaddr_in *crnd)
|
|
{
|
|
unsigned char *res = NULL;
|
|
int i;
|
|
|
|
if (!str) {
|
|
res = (unsigned char*)xmalloc(MD_CHALLENGE_LEN+1);
|
|
res[0] = MD_CHALLENGE_LEN;
|
|
for (i = 1; i < (MD_CHALLENGE_LEN + 1); i += MD5_DIGEST_LEN) {
|
|
int k = MD5_DIGEST_LEN;
|
|
if (k >= i + MD_CHALLENGE_LEN)
|
|
k = MD_CHALLENGE_LEN + 1 - i;
|
|
getrand(res+i, k, crnd);
|
|
}
|
|
} else {
|
|
char *sp;
|
|
if ((sp = strstr(str, "CRAM")) == NULL)
|
|
return NULL;
|
|
if ((sp = strstr(sp, "MD5")) == NULL)
|
|
return NULL;
|
|
while (sp[0])
|
|
if (*sp++ == '-')
|
|
break;
|
|
if (!sp[0])
|
|
return NULL;
|
|
for (i = 0; isxdigit((int)sp[i]); i++)
|
|
if (i >= 128)
|
|
break;
|
|
i /= 2;
|
|
res = (unsigned char*)xmalloc(i+1);
|
|
res[0] = (char)i;
|
|
for (i = 0; isxdigit((int)sp[i]) && (i < 128); i++) {
|
|
unsigned char c=tolower(sp[i]);
|
|
if (c > '9')
|
|
c -= 'a'-10;
|
|
else
|
|
c -= '0';
|
|
if (!(i % 2))
|
|
res[i / 2 + 1] = c << 4;
|
|
else
|
|
res[i / 2 + 1] |= c;
|
|
}
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
|
|
void MD_toString(char *rs, int len, unsigned char *digest)
|
|
{
|
|
int i,j;
|
|
if (!rs)
|
|
return;
|
|
strcpy(rs, "CRAM-MD5-");
|
|
for (i = 0, j = 9; i < len; i++) {
|
|
unsigned char c = (digest[i] >> 4);
|
|
if (c > 9)
|
|
c += 'a'-10;
|
|
else
|
|
c += '0';
|
|
rs[j++] = c;
|
|
c = (digest[i] & 0xF);
|
|
if (c > 9)
|
|
c += 'a'-10;
|
|
else
|
|
c += '0';
|
|
rs[j++] = c;
|
|
}
|
|
rs[j] = 0;
|
|
}
|
|
|
|
|
|
|
|
char *MD_buildDigest(char *pw, unsigned char *challenge)
|
|
{
|
|
char *rs = NULL;
|
|
MDcaddr_t digest;
|
|
|
|
if ((!pw) || (!challenge))
|
|
return rs;
|
|
|
|
hmac_md5(challenge+1, challenge[0], pw, strlen(pw), digest);
|
|
rs = (char *)xmalloc(MD5_DIGEST_LEN * 2 + 10);
|
|
MD_toString(rs, MD5_DIGEST_LEN, digest);
|
|
return rs;
|
|
}
|
|
|